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Does it go black if you you use it as just one single monitor? If it does, you will need to open up to inspect the power supply first. Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums Post back what you see inside so we can guide you further and it will help out other people in the future also. http://en.wikipedia.org/wiki/Capacitor_plague http://www.badcaps.net
Click start, then then control panel and click on the power management icon. When you see the screen, look at the power management "scheme" and pick the appropriate setting. I assume that what you are experiencing is what's known as "Power management" . In order to achieve an "Energy Star" rating, the computer must shut off various components to conserve power. If you don't want to have your monitor shut down, select never from the options in the Power Management screen. Thanks for using Fixya.com
The first Polyview has a power supply problem (a short) and locks out the power until it is unplugged. You need to check the voltages inside the Monitor to determine which component/s are faulty. I hope you know electronics if not leave it to the repair shop because you have neither the skills or equipment to repair it. By the way I am not a monitor repair man but I do have 30 plus years in the electronics field.
The second monitor may have a broken wire in the cord that goes to your computer. Other internal components can cause the same simptoms your seeing. Good luck!
Same as before this sounds very similar to the problem that I had with my polyview v396 19" . Its a power supply problem unclip the panel withdraw the power supply it plugs in on its own seperate board. Look for capacitors that bulge and replace them in fact replace them all on tha board not that hard. Replace them with the same rating voltage and micro fards. Cheaper than relacing the whole panel, hope this helps. :)
Like most of these LCD monitors it is more than likely a PSU problem to do with the Electrolytic Capacitors, These in all probability will be faulty.. there are usually about 4 - 6 from 1000uF to 100uF replace ALL with same or better.